Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/11/2021   10:52:45   (  -0.02,-137.22) (   0.43,-139.17)  222.78                80
 02/12/2021   10:31:08   (  -0.01,-137.22) (  -0.63,-134.59)  300.06                80
 02/13/2021   22:55:26   (   0.01,-137.22) (  -0.55,-139.81)  294.02                80
 02/14/2021   22:33:48   (   0.01,-137.22) (   0.46,-135.22)  228.61                80
 02/16/2021   10:57:56   (  -0.01,-137.22) (   0.68,-140.40)  362.60                80
 02/17/2021   10:36:19   (  -0.01,-137.21) (  -0.34,-135.81)  159.67                80
 02/18/2021   22:57:56   (   0.01,-137.21) (  -0.84,-141.03)  435.40                80
 02/19/2021   22:41:39   (   0.01,-137.20) (   0.17,-136.44)   86.55                80
 02/22/2021   10:41:30   (   0.01,-137.17) (  -0.05,-137.03)   15.77                80